Roller pulverizing-mill



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RGLLER PULVERIZING MILL.

GfR. KING 8v A. RAYMOND.

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RoLLEe PULVERIZING MILL,

N0. 600,876, Patented Mar. 22,1898.

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r'rn Stans GEORGE R. KING, OF NEW YORK, N. Y., AND ALBERT RAYMOND, OF CHICAGO, ILLINOIS.

ROLLER PU LVERFIZING-IVIILL.

SPECIFCATION forming part of Letters Patent No. 600,876, dated March 22, 1898.

Application filed November 17, 1897. Serial No. 658,782. (No model.)

To all whom it may concern:

Be it known that we, GEORGE R. KING, residing in the city, county, and State of New York, and ALBERT RAYMOND, residing in the city of Chicago, in the county of Cook and State of Illinois, citizens of the United States, have invented a new and useful Improvement in Roller Pulverizinglvlills, of which the following` is a specification.

Our improvement relates to that class of pulverizingmills which act upon the principle of centrifugal force by means of rollers revolving on the inner surface of rings or dies, the rollers being mounted two on a roller-shaft and two or more roller-shafts employed in order that one shaft and its pair of rollers shall counterbalance another shaft and its pair of rollers, the dies, rollers, and the roller-shafts being contained within the walls of a suitable case or chamber. When in such mills the operating-shaft passes through the dies and the chamber between the rollershafts, the rollers are necessarily limited in diameter to something less than half the interior diameter of the dies, while rollers of greater diameter are preferable. To render it possible to employ larger rollers was one of the objects of our improvement y'of such mills for which Letters Patent No. 579,588 were granted tous March 30, 1897; but under this patent it is necessary to employ at least two pairs of rollers and two roller-shafts, as only one pair of rollers and one roller-shaft at the required speed of driving such a mill would make it dangerously impracticable, while the employment of two or more roller-shafts and two or more pairs of rollers renders the mills heavier and more expensive than sometimes is required.

The object of our improvement specified in this application is to provide a centrifugal roller pulverizing mill which has but one pair of rollers and one roller-shaft and but one die and the rollers larger in diameter than half the diameter of the die on which they revolve and so arranged and operated that the said rollers and roller-shaft will be self-balanced, all of whichwe attain by the mechanism illustrated by the accompanying drawings, consisting of two sheets, in which- Figure 1 is a plan view of Fig. 2, and Fig. 2 a longitudinal elevation.

Similar designating-numerals refer to similar parts throughout both views.

1 1 represent the bed-plate; 2 2, the legs or standards; 3 3, the driving-shaft, the intermediate portion of which is divided into the form of a quadrangular frame, the sides of the quadrangle (see 3LL 3, Fig. 2) passing outside of the rollers; 4;, the driving-pulley; 5 5, the cylindrical portion of the inclosing chamber of the mill, in which is secured and held the two-faced ring or die 6 6; 7 7, the heads of the inclosing chamber, both having central circular openings extending from 8 to 8; 9 9, the rollers; 10, the roller-shaft; 1l 11, the roller-shaft bearing-boxes; 12 12, the rollershaft carriers, keyed to the drivingshaft and in which are the roller-shaft bearing-boxes, and to which (being part of the same steel casting) are added the inclosing end disks 13 13, which extend from 8 to 8.

'In these end disks is a circular opening,

through which passes the roller-shaft. 15 15 indicate openings at the top of the chamber, through which the material to be pulverized is fed and drawn off.

Having pointed out the several parts of our device, we will now explain their functions and the operation of our improvement.

The double-faced die consists of a heavy steel ring, being beveled fromfthecenter of the inner surface, so as to form two faces, one of which stands parallel with the tread of one roller and the other parallel with the tread of the other roller, and both of the surfaces of the die being at an angle with the drivingshaft. The roller-shaft stands at an angle with the line of the driving-shaft by placing its bearings on exactly opposite sides of the driving-shaft, whereby the ends of the rollershaft move in a vertical circle around the horizontal line of the driving-shaft.

We are aware that centrifugal roller-mills have been made of various constructions. Therefore we do not broadly claim the use of centrifugal rollers irrespective of the manner of arranging and operating them; but

W'hat we do claim as new and useful, and desire to secure by Letters Patent, is

IOO

v 5 nation with rollers having their faces standposes described.

In a centrifugal roller pulverzing-mill, a driving-shaft, whereby one pair of rollers can roller-shaft having its bearings on the oppobe mounted and rapidly revolved on the same site sides of and attached to the driving-shaft shaft and on the same die and counterbalance and standing at an angle therewith in combieach other, substantially as and for the pur I5 ing parallel with their own shaft and at an angle with the driving-shaft at their point of OND contact with the faces of a double-faced rin g, the faces of the said ring standing parallel Witnesses:

Io with the roller-shaft at their points of con- JEROME A. KING, tact with the rollers but at an angle with the A. W. MITCHELL. 

